/Engine/Source/Runtime/Core/Public/Templates/SharedPointer.h
Special constructor used internally to statically cast one shared pointer type to another. You should never call this constructor directly. Instead, use the StaticCastSharedPtr() function. This constructor creates a shared pointer as a shared reference to an existing shared pointer after statically casting that pointer's object. This constructor is needed for static casts.
template<typename OtherType> TSharedPtr ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< OtherType, Mode > const & InSharedPtr, [SharedPointerInternals::FStaticCastTag](API\Runtime\Core\Templates\FStaticCastTag) )